A Novel Quantitative Trait Locus (QTL) Reduces Fusarium graminearum Infection in Glycine max Seedlings.

IF 2.6 2区农林科学 Q2 PLANT SCIENCES

Phytopathology Pub Date : 2025-02-19 DOI:10.1094/PHYTO-11-24-0364-R

Christopher Detranaltes, Charles Quigley, Qijian Song, Jianxin Ma, Guohong Cai

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Abstract

Over the past five years, seedling diseases have caused an average annual loss of $21.8 million dollars' worth of United States' soybean (Glycine max (L.) Merr.) production, with Fusarium graminearum (teleomorph Gibberella zeae (Schwein.) Petch) emerging as a significant threat within the seedling disease complex. Its cross-pathogenicity on wheat and maize, along with increasing reports of fungicide resistance, highlights the need for improved genetic resistance in soybean. In a previous germplasm screening and genome-wide association study (GWAS) we identified a significantly resistant accession, PI 438500, from a panel of 208 diverse soybean accessions. This accession carried fewer marker-trait associations (MTAs) and lower predicted resistance than other significantly resistant accessions yet displayed a highly resistant phenotype with low standard deviations. In this study, we developed an F_2:3 mapping population from a bi-parental cross between PI 438500 and PI 548631 (highly susceptible to F. graminearum) and identified a quantitative trait locus (QTL) that explains 20.29% of the variation in post-emergent visual severity. This QTL region contains multiple candidate genes with predicted roles in plant defense mechanisms and helps elucidate PI 438500's significant resistance to F. graminearum. Molecular markers linked and within this QTL region can help facilitate marker-assisted selection for F. graminearum resistance in soybean breeding.

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一个新的数量性状位点（QTL）减少了甘氨酸幼苗的镰刀菌感染。

在过去的五年中，秧苗病害已造成美国大豆（Glycine max (L.)）平均每年损失2180万美元。玉米赤霉病菌（镰刀菌）生产。在幼苗病复合体中出现的一个重大威胁。它对小麦和玉米的交叉致病性，以及越来越多的杀菌剂抗性报道，突出了提高大豆遗传抗性的必要性。在之前的种质筛选和全基因组关联研究（GWAS）中，我们从208个不同的大豆品种中鉴定出一个具有显著抗性的品种PI 438500。与其他显著抗性品种相比，该品种携带较少的标记性状关联（mta）和较低的预测抗性，但表现出低标准偏差的高抗性表型。在这项研究中，我们从PI 438500和PI 548631（对谷草赤霉病高度敏感）的双亲本杂交中建立了F2:3定位群体，并确定了一个数量性状位点（QTL），该位点解释了20.29%的出现后视觉严重程度变异。该QTL区域包含多个候选基因，这些候选基因在植物防御机制中具有预测作用，有助于阐明PI 438500对F. graminearum的显著抗性。该QTL区域内的分子标记可为大豆抗性的标记辅助选择提供帮助。

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来源期刊

Phytopathology 生物-植物科学

CiteScore

5.90

自引率

9.40%

发文量

505

审稿时长

4-8 weeks

期刊介绍： Phytopathology publishes articles on fundamental research that advances understanding of the nature of plant diseases, the agents that cause them, their spread, the losses they cause, and measures that can be used to control them. Phytopathology considers manuscripts covering all aspects of plant diseases including bacteriology, host-parasite biochemistry and cell biology, biological control, disease control and pest management, description of new pathogen species description of new pathogen species, ecology and population biology, epidemiology, disease etiology, host genetics and resistance, mycology, nematology, plant stress and abiotic disorders, postharvest pathology and mycotoxins, and virology. Papers dealing mainly with taxonomy, such as descriptions of new plant pathogen taxa are acceptable if they include plant disease research results such as pathogenicity, host range, etc. Taxonomic papers that focus on classification, identification, and nomenclature below the subspecies level may also be submitted to Phytopathology.